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Micro Chapter 4
Term | Definition |
---|---|
Growth | In terms of numbers |
Binary Fission | How prokaryotes divide |
Physical Requirements for Growth | -Temperature -pH -Osmotic Pressue |
Psychrophiles | Cooler conditions slow down growth, but eventually cause spoilage |
Mesophiles | Best at body temperature and most common |
Thermophiles | Grow best in hot temperatures |
pH | 7 is the best pH for growth |
Acidophiles | Grow under acidic conditions |
Hypotonic | Cell swells, H2O in |
Isotonic | Cell is stable, H2O in & H2O out |
Hypertonic | Cell shrivels, H2O out |
Extremophiles | Any bacteria that live under extreme conditions |
Chemical Requirements for Growth | -Carbon -Oxygen |
Carbon | All cells need Carbon |
Chemoautotrophs | Uses Carbon to produce food (plants) |
Chemoheterotrophs | Needs others for sources of Carbon (humans) |
Microaerophiles | -Require small amounts of O2 -Aerobic |
Obligate Aerobes | -Have to have constant O2 -Aerobic |
Aerotolerant | -Don't use O2, but can tolerate it -Aerobic |
Facultative | -Uses O2 when present, but ferments when it is not -Anaerobic |
Obligate Anaerobes | -Harmed by O2 (toxic to them) -Anaerobic |
Quorum Sensing | Bacteria communication through chemicals |